English
Suomi
Blue noise gets stronger as pitch rises, by about 3 dB each time the frequency doubles, so it sounds thin and hissy. It is the mirror image of pink noise; violet noise rises twice as fast and sounds sharper still.
Blue, violet and white
White noise has equal power at every frequency. Blue noise tilts that upwards by about 3 dB each time the frequency doubles, and violet noise by about 6 dB, so violet is the sharper of the two.
Blue noise outside sound
The same idea appears in printing and image processing, where blue noise describes a scatter of dots with no clumps. Clumping is a low-frequency pattern, so removing it leaves only the high frequencies: blue noise, applied to pixels.
Hush's bright noises
Between 2 and 12 kHz, Blue static rises 4.9 dB per octave and Violet static rises 6.1 dB per octave. Mist static and Ivory noise stay close to level across the same range, so they sound bright without the edge.
Band by band, in numbers
| Band | White static | Blue static | Difference |
|---|---|---|---|
| 2 kHz | −7.8 dB | −13.8 dB | −6.0 dB |
| 2.5 kHz | −7.2 dB | −12.2 dB | −5.0 dB |
| 3 kHz | −6.6 dB | −10.9 dB | −4.3 dB |
| 4 kHz | −5.7 dB | −8.7 dB | −3.0 dB |
| 5 kHz | −4.8 dB | −6.9 dB | −2.1 dB |
| 6 kHz | −4.2 dB | −5.5 dB | −1.3 dB |
| 8 kHz | −3.5 dB | −3.4 dB | +0.1 dB |
| 10 kHz | −3.8 dB | −2.2 dB | +1.6 dB |
| 12 kHz | −4.6 dB | −1.7 dB | +2.9 dB |
